Low operation voltage transparent resistive random access memory (T-RRAM) based on ultrathin a-TiOx films and its resistive switching characteristics

A fully transparent resistive random access memory (T-RRAM) device based on an ultrathin a-TiOx storage layer sandwiched between the top ITO and bottom FTO electrodes (ITO/a-TiOx/FTO) was fabricated on the glass substrate. The memory device exhibited not only good optical transmittance (similar to 80%) but also a bipolar resistive switching characteristic with low operation voltage (-0.5V/+1V), low operation current (500 mu A), high R-OFF/R-oN ratio (> 100), reasonable endurance (>10(2) cycles), and retention characteristics (10(4) s). The resistive switching mechanism could be explained by the formation and rupture of the oxygen vacancies induced conductive filament near ITO and a-TiOx interface. Our devices demonstrated the great potential for future transparent electronic applications.